Belt-tightener.



E. D. MACKINTOSH.

BELT TIGHTENER.

APPLICATION FILED SEPT-29, 191s.

Patented Mar. 27, 1917.

@Trfilhlti FATE FEM).

EDWARD D. MACKINTOSH, OF BROOKLYN, NEV] YORK, ASSIGNOE OF ONE-HALF TO S. S.

HEPWOBTI-I COMPANY, OF NEN YORK, N. 1 A COBPORATIGN OF NEW YORK.

IBELT-TIGHTENER.

Specification of Letters Patent.

Patented Mar. 27, 1917..

To all whom it may concern.

Be it known that I, EDWARD D. MAOKIN- TOSH, of the borough of Brooklyn, city of New York, county of Kings, and State of New York, have invented an Improvement in Belt-Tighteners, of which the following is a specification.

My invention relates to automatic means for keeping driving belts tight, as they stretch in use.- Its object is, to hold the tightener out of operative position, and thus leave the belt slack, while the latter is being placed in position on pulleys, or removed therefrom, or when it is to remain idle.

Referring to the accompanying drawings, forming part of this specification:

Figure 1 is a side elevation of my improved belt tightener.

Fig. 2 is a front view of a socket and horns, of which a side view is shown in Fig. 1.

Fig. 3 is a front view of a latch, of which a side view is shown in Fig. 1.

1 is a pulley carried by a frame 2 that is movable by swinging on a fixed support 3.

4 and 5 are links pivoted together at 6, to form a toggle. This toggle is pivoted, at 7 and 8, to the frame 2 and to a lever 9. The lever is pivoted to a fixed support 10 and is provided with a weight 11. The weight acts through the lever to push the toggle against the frame and press the pulley 1 against the belt 12.

13 is a latch, adapted to enter a socket 14 and rest therein on horns 15, as shown by the broken line positions of these parts, thus holding the pulley back from pressing against the belt.

While my device is operating to keep the belt tight the two links of the toggle maintain the positions, in relation to each other. shown by the full lines. In other words. the entire toggle moves bodily as one piece. With the links in such positions, a new belt is made of a length to commence doing its work with the lever 9 at its highest. position. The entire movement of the pulley 1, due to the falling of the lever 9 under ing belt, a movable the action of gravity on the weight 11, will then be devoted to taking up such stretch of the belt as may follow continued use. This means that the belt will be tight with the lever in its highest position and the pulley 1 in a corresponding position. But, to get the belt in position easily, it must be loose. In order tional motion is given to the pulley by raising the link 5 and the lever 9 and bringing the various parts into the positions shown by broken lines. They are held in this position, while the belt is put in place, by the engagement of the latch 13 with the horns 15. When the belt has been put in place, the latch is lifted out of engagement with the horns and the belt is tightened by pulling down the link 5. It is then kept tight, as it stretches, by the movement of the various parts due to the action of gravity on the weight 11.

What I claim as new, and desire to secure by Letters Patent, is:

1. A pulley for pressing against a driving belt, a movable frame carrying the pulley, and means, including a bodily movable toggle, for moving the frame.

2. A pulley for pressing against a driving belt, a movable frame carrying the pulley, means, including a bodily movable tog gle, for moving the frame, and means for holding the pulley back from pressing on the belt.

3. A pulley for pressing against a driving belt, a movable frame carrying the pulley, a lever, and a bodily movable toggle connecting the frame and the lever.

1. A pulley for pressing against a driving belt, a movable frame carrying the pulley, a weighted lever, and a bodily movable toggle pushed against the frame by the action of gravity on the lever.

5. A pulley for pressing against a drivframe carrying the pulley, a lever, a bodily movable toggle connecting the frame and the lever, and means for holding the pulley back from pressing on the belt.

that it may be, addi-- In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

EDWARD D. MACKINTOSH.

Witnesses:

CHARLES A. OLco'rT, DOUGLAS M. GARDNER.

6. A, pulley for pressing against a driving belt, a movable frame carrying the pulley, a weighted lever, a bodily movable toggle adapted to be pushed against the 5 frame by the action of gravity on the lever, and. means for holding the pulley back from pressing on the belt.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' v Washington, D. G. 

